Question

Factor completely 3x^2+ 2x -1.
O (3x + 1)(x - 1)
O (3x + 1)(x + 1)
O (3x - 1)(x + 1)
O (3x - 1)(x - 1)

Answer 1

Answer:

option C

Step-by-step explanation:

$3x^2+2x-1\\\\=(3x+a)(x+b)\\\\(3b+a)=2\\\\ab=-1$

and here we think of b=1 and a=-1

so we have

$(3x-1)(x+1)$